Hypodermic syringe for injecting liquids into the body or for taking them therefrom



F. MEYER June 9, 1931.

HYPODERMIC SYRINGE FOR INJECTING LIQUIDS INTO THE BODY OR FOR TAKINGTHEM THEREFROM Original Filed Nov. '7, 1924 IN V EN TOR.' Ejldz/el" Wim/A T [ORNE YS.

Patented June 9, 1931 UNTED STATES lice FELIX MEYER, OF AACHEN,GERTJIANY HYPODERMIG SYRINGE FOR INJECTING LIQUIIDS INTO THE BODY OR FORTAKNG- THEM i THEREFROIVI Original application filed November -7, 1924,Serial' No. 748,390, and in Germany May 31, 1924. Divided and thisapplication iiled June 23, 1930. Serial No. 463,260.

This invention relates to hypodermic syringes for injecting liquids intothe body or for taking them therefrom.

According to the present invention the syringe is provided with anelastic stopper and a cannula carried by and passing through the saidstopper and extending into the interior of the syringe, the part of thecannula projecting therein being opened or closed with respect theretoby moving the stopper irom the outside.

The substance with which the syringe is charged, is under pressure orthe syringe contains a vacuum according as to whether the iiuid is to beinjected into the body or substance to be drawn therefrom. The injectinginto and the drawing from the body are effected with thevaid of acannula which is inserted into an existing aperture or into an openingto be produced. In the latter case the cannula is fitted with a hollowmetal needle preferably fused together therewith. The syringe is closedby a stopper consisting of rubber or of another suitable elasticmaterial which serves as a holder for the cannula. rhis cannula projectspartly outside and partly inside the syringe. The part proj e'cting intothe syringe is separated from the interior of the syringe by a lid orcasing which is only opened when the syringe is to be applied. Theopening is eEected from the' outside by moving the elastic .stoppereither directly, for instance by pressing, pulling or twisting thesame,.or by moving the cannula.

By opening the cannula a connection 1s established between the interiorof the syringe and that of the cannula. In order to be able to interruptthe operation, the arrangement is such as to allow the said connectionto open 40 and close at will by moving the stopper or the cannula. Thepart of the cannula projecting into the interior of the syringe may beshaped in such a manner that, when in a state of rest, it presses withits opening so firmly against the elastic stopper, that the opening isthereby closed. By exerting a' lateral pressure directly on to the partlof the stopper projecting outside the syringe or on to the outerprojecting part pf the cannula, the opening of its part projecting intothe syringe is forced away from the rubber stopper and is closed againwhen the pressure is released. The cannula is provided with a needle sothat when the latter is driven into a blood vessel for instance into astopped vein, blood will enter into the cannula, the quantity and colourof the blood that has penetrated therein allowing an opinion to beformed as to whether a certain kind of blood vessel has been struck ornot. The inner part of the cannula may be so constructed that it isnormally completely closed, an opening being produced therein by aportion ofthe said inner part of the cannula being broken off, suchbreaking being caused also by moving the stopper or the outer part ofthe cannula. Also in this case the part of the cannula projectingintothe syringe may be so constructed that the opening of the remaining partof the cannula bears against an elastic cover which closes the openingwhen the stopper is in a certain position.

Referring to the accompanying drawings Figurel shows a syringe forinjecting luids into an existing or natural opening of the body. Theinner end of the cannula K1 carried by the rubber stopper P1 andprojecting into the syringe is bent at a right angle, and the opening ofthis bent portion bears iirmly againstthe inner wall of the rubberstopper P1. By bendingrthe stopper, the latter and the cannula assumethe position indicated in dotted linesv and thecannula K1 is opened tothe interior of the syringe. v

Figure 2V shows a similar construction which is however fitted with ahollow metal needle N2 for injecting liquids into the tissue of thebody. Szis a sheath enclosing the needle, which sheath is removed whenthe syringe is to be used. y

Figure 3 shows the same arrangement as Figure 2. The end of the cannulaK2 in this construction is provided with a hollow chamber H3 into whichthe blood can enter and which forms the indicating device hereinbe-'fore described. The cannula also has a lateral open extension which canbe closed and opened with respect to the interior of the. syringe ashereinbefore described.

The hollow chamber H3 forming the indieating device may however be soarranged as to follow directly the hollow needle and to extend partlyoutside the syringe for instance between the outer end of the stopperand the hollow needle. This modification Whichl is illustrated in Figure4iand in which IQ. is. the cannula, H4. the hollow cha1nberP.l thestopper and N.l the hollow needle, is ofspecial advantage7 When. anopaque injecting liquid. is used through which the blood cannot be seen.

In Figure 5 the cannula K5 Within the syringe is completely closed andis brok-en at a certain Weak point by moving the stopper P5 so that theend of the cannula. K5 is pressed against the inner Wall of the syringe.

In: Figure G the cannula KG is so shaped that after it has been brokenat a` Weak point iu the man-ner described with reference to Figure 5,the opening that is thereby left in thel cannula may be closed from theoutside by pressing the cannula against the inner Walll of they stopperP0.

The invention. also relates toa simple process for evaeuating syringesot the/hind above described. or :tor tillin g them with liquids or gasesunder pressure. For this purpose a hollow needle F as shown in Figureset and 7 is passed: through thestopper P7 until its end projects intothe interior of the syringe. This hollow needle F is connected at itsother end toa gasor liquid supply. Thegas contained inI the closedsyringe is either drawn oi through thehollow needle F so that a vacuuniis produced therein, or the gas is driven i'ntothe syringe bypressurefso that the latter contains compressed gas, or a liquid isforced into the syringe through the needle F', Whereby the` gas in thesyringe is com-pressed,v so tliat whenv they cannula K7 is subsequentlyopenedl to the interior of the syringe the gas,

un consequence of its expansion7 forces the liquid out of the syringeagain. After the syringe has been evacuated or lil-led, the hollowneedle F is pulled out whereupon the rubber stopper PT automaticallycloses at the point where it has been pierced.

VVhat I claim is 'n a device of the character described including aneedle, a mounting and a transparent container having an internalvpressure different to that of the atmosphere, and adapted forcommunication With the needle, a frangibl'e capillary tube seal oftransparent material forming initially a continuation of the passagethrough the needle from the innenend of the needle Within saidcontainer.

In testimony whereof'r I have signed my name to this speciflication.

FELIX MEYER.

